Valve.



rvmw erre om -T BENJAMIN Lewis, on sonnrvnorenii roux, ASSIGNOB T0 GENERAL ELE'crnro co vrrANY, a conrone'rroiv on NEW Yon-K.

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Be it known thatI, BENJAMIN; Lnwrs, a citizen of the United States, residing at Schenectady, in the county of Schenectady, State of New York, have invented certain new and useful Improvements in Valves of whichthe following is a specification.

My invention relates to rotary valves, and the object of my invention is to prevent the leakage of fluid therethrough. I f

The pressure of the source of fluid isthe greatest and most constant pressure to which a valve is subjected and which it must resist.

Now a puppet valve is well adapted to control the flow offluid through a single pas: sage; on the other hand a; rotary surface valve or other slide valve is particularly adapted to direct the flow of fluid between different pairs of a number of passages opening to the valve. I propose toprovide a valve structure possessingthe advantages of a rotary surface valve in directing the flow of fluid between a number of passages with the ability ofa puppet valve .toresist the pressure of the source of fluid. To do this, I provide a puppet valve in the admission passage to the seat of a rotary valve to relieve the rotary valve of the pressure of the source except when the rotary valve connects the admission passage to another. This is an efficient, inexpensive and readily renewable means for sealingthe source of pressure from the other passages and leaves to the rotary valve the direction of the fluid flow. spring-seated and the means for unseating the puppet valve is a suitably shaped cam on the rotary valve stem, which cam engages the puppet valve stem and moves it against the spring pressure as the rotary valve is turned to a certain position or positions.

In the accompanying drawing, I have illustrated a particular valve involving my invention.

Figure 1 is a sectional view of thisvalve; Fig. 2 is a view partly in section showing the puppet valve and its operating cam, and Fig. 8 is a view partly in section along the line 33 of Fig. 1. l

The valve casing 1 is provided withithe passages 2 leading to the various ports. The port 3 is an exhaust port. Theports 4 and 5 lead to the devices to which it may be desired to supply fluid. The passages 2 and the port 3 all leadto the rotary valve seat 6 Specification of Letters Patent.

Preferably, the 1 puppet valve is onwhich is seated the rotary surfacevalve Patented Get. 12; 1915." Application filed Ju1y 29,1913. Serial No. 781,757. I

7 An admissionipassage 8 conducts fluid under pressure from the admission port 9 to the valve seat 6..

The rotary valve 7 is provided with a stem 10 for operating the same. ries cam members 11 and also the arm 12.

This stem can:

A spring 13 acting on the arm 12 tendsto I return the rotary valve stem 10 and the rotary valve 7 to the mid position illustrated. The rotary valve stem 10 may be provided with a handle or other means for rotating thesame.

Aportion of the admission passage is extended. to a pointopposite the cams 11. In this particular valve, this is done by carrying the passage 8 parallel to the rotary valve stem 10. In this portion of the ad'- mlssion passage 8 is located the puppet valve 14 provided with a stenrl5. The puppet valve seat facesflthe admission port 9 in order that the pressure in the source of fluid pressure may help to maintain the puppet J valve 14 tightly against its seat and hence through the exhaust port 3. To accomplish i I this, the face of the rotary surface valve 7 is provided with two passages 17 diametrically opposite to each other and of such 7 length as to extend from their respective passages 2 to the admission passage 8 and from their respective passages 2 to the exhaust port 3. i a

The operation of this valve is as follows: vVith the rotary valve stem 10 in the neutral position illustrated, all the ports are closed. There is no tendency for the fluid pressure of the source to force fluid between the rotary valve 7 and its seat into'one of the passages 2, because the rotary valve 7 is not subject to the pressure of the source of fluid supply, this pressure being received on the puppet valve 14. If, now, the rotary valve 7 is rotated to the right, considering Fig. 2, the passage 2 from the port 4 is connected to the admission passage 8; one of the earns 11 engages the stem 15 of the puppet valve let, opening passage 8 and-allowing fluid to flow from the port 9 through the rotary valve 7 to the port 4. At the same time the opposite passage 17 in the rotary valve 7 connects thep'assage 2 from the port to the exhaust port 3, allowing whatever fluid there .may be in this passage to escape. As soonas the rotary valvestem 10 is released, it is returned by the spring 13 tothe lap position shown in the drawing and the puppet valve leis reseated'byits spring 16. If the rotary It will be understood that in 'itsbroadest aspect my invention is not limited to the particular embodiment shown in the drawfromthe spirit and scope of my invention as ings, and I aim in the appended claims to cover all modifications which do not depart therein defined. U I V WVhat I claim as new and desire to secure by Letters Patent of the United States is 1 in valve casing provided with ports, a passage for admitting fluid to the valve seat and passages'from the valve seat to the ports, arotatable surface valve on the seat for directing the flow of fluid between the desired passages, a puppet valve in the admission passage tending to close this passage, and means for rotating the rotatable valve and 'to'the rotatablevalve stem adapted to for unseating thepuppet valve when fluid is to be directed from the admission passage to another. 7

2. A valve casing provided with ports, a

passage for admitting fluid to the valve seat valve seatyanadmission'passage to the seat and passages between the, seat and the ports,

a rotatable surface valve on said seat, astein for rotating said valve provided with'a cam surface, a portion of the admission passage extending to opposite the cam on the stem, and a puppet valve in that part ofsaid admission passagewith its stem perpendicular be engaged by said cam surface.

. In witness whereof, I have my'hand this 26th dav of July, 1913;

- BENJAMIN LEWIS.

hereunto set lVitnesses 1 HELEN ORroRD,

. MARGARET E. WVooLLEY.

Copies of this patent may be obtained for .five'eents each, by addressing the Commissioner of Patents.

5 Washington, D. G. 

